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The easiest way to find a vacuum leak involves using any brand/type of carburetor cleaner or any some other type of cleaner in a spray can or spray bottle. With the engine running you spray around the suspected area . If there is a leak at the location you are spraying the carb cleaner, you will immediately notice an increase in the RPM of the engine. You can use this method to find cracks in a vacuum hose that are very hard to see if they are surrounded by wiring harness' and other items. This also works if you have a carb or throttle body base gasket leaking, intake manifold gasket leaking or even mismatched manifold with the cylinder heads.
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Need to know the location of the vacuum leak in order to answer this.
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With a vacuum pump and an ac manifold set. Instead of pressurizing the system you pull down a vacuum of 29-30 in hg, close the valves and wait to see if the vacuum drops or remains at 29-30 in hg by monitering the gauges on the manifold set. I like to leave it in that position for an hour or two to be sure it doesnt lose vacuum. If it drops even a little you have a leak in which case I would charge the system with a shot of UV leak detector. You can locate the source of the leak with a black light after the system as been run for a while.
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